// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2006-2010 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_DENSECOEFFSBASE_H
#define EIGEN_DENSECOEFFSBASE_H

namespace Eigen {

namespace internal {
template<typename T>
struct add_const_on_value_type_if_arithmetic
{
	typedef typename conditional<is_arithmetic<T>::value, T, typename add_const_on_value_type<T>::type>::type type;
};
}

/** \brief Base class providing read-only coefficient access to matrices and arrays.
 * \ingroup Core_Module
 * \tparam Derived Type of the derived class
 *
 * \note #ReadOnlyAccessors Constant indicating read-only access
 *
 * This class defines the \c operator() \c const function and friends, which can be used to read specific
 * entries of a matrix or array.
 *
 * \sa DenseCoeffsBase<Derived, WriteAccessors>, DenseCoeffsBase<Derived, DirectAccessors>,
 *     \ref TopicClassHierarchy
 */
template<typename Derived>
class DenseCoeffsBase<Derived, ReadOnlyAccessors> : public EigenBase<Derived>
{
  public:
	typedef typename internal::traits<Derived>::StorageKind StorageKind;
	typedef typename internal::traits<Derived>::Scalar Scalar;
	typedef typename internal::packet_traits<Scalar>::type PacketScalar;

	// Explanation for this CoeffReturnType typedef.
	// - This is the return type of the coeff() method.
	// - The LvalueBit means exactly that we can offer a coeffRef() method, which means exactly that we can get
	// references to coeffs, which means exactly that we can have coeff() return a const reference (as opposed to
	// returning a value).
	// - The is_artihmetic check is required since "const int", "const double", etc. will cause warnings on some systems
	// while the declaration of "const T", where T is a non arithmetic type does not. Always returning "const Scalar&"
	// is not possible, since the underlying expressions might not offer a valid address the reference could be
	// referring to.
	typedef typename internal::conditional<
		bool(internal::traits<Derived>::Flags& LvalueBit),
		const Scalar&,
		typename internal::conditional<internal::is_arithmetic<Scalar>::value, Scalar, const Scalar>::type>::type
		CoeffReturnType;

	typedef
		typename internal::add_const_on_value_type_if_arithmetic<typename internal::packet_traits<Scalar>::type>::type
			PacketReturnType;

	typedef EigenBase<Derived> Base;
	using Base::cols;
	using Base::derived;
	using Base::rows;
	using Base::size;

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Index rowIndexByOuterInner(Index outer, Index inner) const
	{
		return int(Derived::RowsAtCompileTime) == 1	  ? 0
			   : int(Derived::ColsAtCompileTime) == 1 ? inner
			   : int(Derived::Flags) & RowMajorBit	  ? outer
													  : inner;
	}

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Index colIndexByOuterInner(Index outer, Index inner) const
	{
		return int(Derived::ColsAtCompileTime) == 1	  ? 0
			   : int(Derived::RowsAtCompileTime) == 1 ? inner
			   : int(Derived::Flags) & RowMajorBit	  ? inner
													  : outer;
	}

	/** Short version: don't use this function, use
	 * \link operator()(Index,Index) const \endlink instead.
	 *
	 * Long version: this function is similar to
	 * \link operator()(Index,Index) const \endlink, but without the assertion.
	 * Use this for limiting the performance cost of debugging code when doing
	 * repeated coefficient access. Only use this when it is guaranteed that the
	 * parameters \a row and \a col are in range.
	 *
	 * If EIGEN_INTERNAL_DEBUGGING is defined, an assertion will be made, making this
	 * function equivalent to \link operator()(Index,Index) const \endlink.
	 *
	 * \sa operator()(Index,Index) const, coeffRef(Index,Index), coeff(Index) const
	 */
	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType coeff(Index row, Index col) const
	{
		eigen_internal_assert(row >= 0 && row < rows() && col >= 0 && col < cols());
		return internal::evaluator<Derived>(derived()).coeff(row, col);
	}

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType coeffByOuterInner(Index outer, Index inner) const
	{
		return coeff(rowIndexByOuterInner(outer, inner), colIndexByOuterInner(outer, inner));
	}

	/** \returns the coefficient at given the given row and column.
	 *
	 * \sa operator()(Index,Index), operator[](Index)
	 */
	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType operator()(Index row, Index col) const
	{
		eigen_assert(row >= 0 && row < rows() && col >= 0 && col < cols());
		return coeff(row, col);
	}

	/** Short version: don't use this function, use
	 * \link operator[](Index) const \endlink instead.
	 *
	 * Long version: this function is similar to
	 * \link operator[](Index) const \endlink, but without the assertion.
	 * Use this for limiting the performance cost of debugging code when doing
	 * repeated coefficient access. Only use this when it is guaranteed that the
	 * parameter \a index is in range.
	 *
	 * If EIGEN_INTERNAL_DEBUGGING is defined, an assertion will be made, making this
	 * function equivalent to \link operator[](Index) const \endlink.
	 *
	 * \sa operator[](Index) const, coeffRef(Index), coeff(Index,Index) const
	 */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType coeff(Index index) const
	{
		EIGEN_STATIC_ASSERT(internal::evaluator<Derived>::Flags & LinearAccessBit,
							THIS_COEFFICIENT_ACCESSOR_TAKING_ONE_ACCESS_IS_ONLY_FOR_EXPRESSIONS_ALLOWING_LINEAR_ACCESS)
		eigen_internal_assert(index >= 0 && index < size());
		return internal::evaluator<Derived>(derived()).coeff(index);
	}

	/** \returns the coefficient at given index.
	 *
	 * This method is allowed only for vector expressions, and for matrix expressions having the LinearAccessBit.
	 *
	 * \sa operator[](Index), operator()(Index,Index) const, x() const, y() const,
	 * z() const, w() const
	 */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType operator[](Index index) const
	{
		EIGEN_STATIC_ASSERT(Derived::IsVectorAtCompileTime,
							THE_BRACKET_OPERATOR_IS_ONLY_FOR_VECTORS__USE_THE_PARENTHESIS_OPERATOR_INSTEAD)
		eigen_assert(index >= 0 && index < size());
		return coeff(index);
	}

	/** \returns the coefficient at given index.
	 *
	 * This is synonymous to operator[](Index) const.
	 *
	 * This method is allowed only for vector expressions, and for matrix expressions having the LinearAccessBit.
	 *
	 * \sa operator[](Index), operator()(Index,Index) const, x() const, y() const,
	 * z() const, w() const
	 */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType operator()(Index index) const
	{
		eigen_assert(index >= 0 && index < size());
		return coeff(index);
	}

	/** equivalent to operator[](0).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType x() const { return (*this)[0]; }

	/** equivalent to operator[](1).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType y() const
	{
		EIGEN_STATIC_ASSERT(Derived::SizeAtCompileTime == -1 || Derived::SizeAtCompileTime >= 2, OUT_OF_RANGE_ACCESS);
		return (*this)[1];
	}

	/** equivalent to operator[](2).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType z() const
	{
		EIGEN_STATIC_ASSERT(Derived::SizeAtCompileTime == -1 || Derived::SizeAtCompileTime >= 3, OUT_OF_RANGE_ACCESS);
		return (*this)[2];
	}

	/** equivalent to operator[](3).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE CoeffReturnType w() const
	{
		EIGEN_STATIC_ASSERT(Derived::SizeAtCompileTime == -1 || Derived::SizeAtCompileTime >= 4, OUT_OF_RANGE_ACCESS);
		return (*this)[3];
	}

	/** \internal
	 * \returns the packet of coefficients starting at the given row and column. It is your responsibility
	 * to ensure that a packet really starts there. This method is only available on expressions having the
	 * PacketAccessBit.
	 *
	 * The \a LoadMode parameter may have the value \a #Aligned or \a #Unaligned. Its effect is to select
	 * the appropriate vectorization instruction. Aligned access is faster, but is only possible for packets
	 * starting at an address which is a multiple of the packet size.
	 */

	template<int LoadMode>
	EIGEN_STRONG_INLINE PacketReturnType packet(Index row, Index col) const
	{
		typedef typename internal::packet_traits<Scalar>::type DefaultPacketType;
		eigen_internal_assert(row >= 0 && row < rows() && col >= 0 && col < cols());
		return internal::evaluator<Derived>(derived()).template packet<LoadMode, DefaultPacketType>(row, col);
	}

	/** \internal */
	template<int LoadMode>
	EIGEN_STRONG_INLINE PacketReturnType packetByOuterInner(Index outer, Index inner) const
	{
		return packet<LoadMode>(rowIndexByOuterInner(outer, inner), colIndexByOuterInner(outer, inner));
	}

	/** \internal
	 * \returns the packet of coefficients starting at the given index. It is your responsibility
	 * to ensure that a packet really starts there. This method is only available on expressions having the
	 * PacketAccessBit and the LinearAccessBit.
	 *
	 * The \a LoadMode parameter may have the value \a #Aligned or \a #Unaligned. Its effect is to select
	 * the appropriate vectorization instruction. Aligned access is faster, but is only possible for packets
	 * starting at an address which is a multiple of the packet size.
	 */

	template<int LoadMode>
	EIGEN_STRONG_INLINE PacketReturnType packet(Index index) const
	{
		EIGEN_STATIC_ASSERT(internal::evaluator<Derived>::Flags & LinearAccessBit,
							THIS_COEFFICIENT_ACCESSOR_TAKING_ONE_ACCESS_IS_ONLY_FOR_EXPRESSIONS_ALLOWING_LINEAR_ACCESS)
		typedef typename internal::packet_traits<Scalar>::type DefaultPacketType;
		eigen_internal_assert(index >= 0 && index < size());
		return internal::evaluator<Derived>(derived()).template packet<LoadMode, DefaultPacketType>(index);
	}

  protected:
	// explanation: DenseBase is doing "using ..." on the methods from DenseCoeffsBase.
	// But some methods are only available in the DirectAccess case.
	// So we add dummy methods here with these names, so that "using... " doesn't fail.
	// It's not private so that the child class DenseBase can access them, and it's not public
	// either since it's an implementation detail, so has to be protected.
	void coeffRef();
	void coeffRefByOuterInner();
	void writePacket();
	void writePacketByOuterInner();
	void copyCoeff();
	void copyCoeffByOuterInner();
	void copyPacket();
	void copyPacketByOuterInner();
	void stride();
	void innerStride();
	void outerStride();
	void rowStride();
	void colStride();
};

/** \brief Base class providing read/write coefficient access to matrices and arrays.
 * \ingroup Core_Module
 * \tparam Derived Type of the derived class
 *
 * \note #WriteAccessors Constant indicating read/write access
 *
 * This class defines the non-const \c operator() function and friends, which can be used to write specific
 * entries of a matrix or array. This class inherits DenseCoeffsBase<Derived, ReadOnlyAccessors> which
 * defines the const variant for reading specific entries.
 *
 * \sa DenseCoeffsBase<Derived, DirectAccessors>, \ref TopicClassHierarchy
 */
template<typename Derived>
class DenseCoeffsBase<Derived, WriteAccessors> : public DenseCoeffsBase<Derived, ReadOnlyAccessors>
{
  public:
	typedef DenseCoeffsBase<Derived, ReadOnlyAccessors> Base;

	typedef typename internal::traits<Derived>::StorageKind StorageKind;
	typedef typename internal::traits<Derived>::Scalar Scalar;
	typedef typename internal::packet_traits<Scalar>::type PacketScalar;
	typedef typename NumTraits<Scalar>::Real RealScalar;

	using Base::coeff;
	using Base::colIndexByOuterInner;
	using Base::cols;
	using Base::derived;
	using Base::rowIndexByOuterInner;
	using Base::rows;
	using Base::size;
	using Base::operator[];
	using Base::operator();
	using Base::w;
	using Base::x;
	using Base::y;
	using Base::z;

	/** Short version: don't use this function, use
	 * \link operator()(Index,Index) \endlink instead.
	 *
	 * Long version: this function is similar to
	 * \link operator()(Index,Index) \endlink, but without the assertion.
	 * Use this for limiting the performance cost of debugging code when doing
	 * repeated coefficient access. Only use this when it is guaranteed that the
	 * parameters \a row and \a col are in range.
	 *
	 * If EIGEN_INTERNAL_DEBUGGING is defined, an assertion will be made, making this
	 * function equivalent to \link operator()(Index,Index) \endlink.
	 *
	 * \sa operator()(Index,Index), coeff(Index, Index) const, coeffRef(Index)
	 */
	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& coeffRef(Index row, Index col)
	{
		eigen_internal_assert(row >= 0 && row < rows() && col >= 0 && col < cols());
		return internal::evaluator<Derived>(derived()).coeffRef(row, col);
	}

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& coeffRefByOuterInner(Index outer, Index inner)
	{
		return coeffRef(rowIndexByOuterInner(outer, inner), colIndexByOuterInner(outer, inner));
	}

	/** \returns a reference to the coefficient at given the given row and column.
	 *
	 * \sa operator[](Index)
	 */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& operator()(Index row, Index col)
	{
		eigen_assert(row >= 0 && row < rows() && col >= 0 && col < cols());
		return coeffRef(row, col);
	}

	/** Short version: don't use this function, use
	 * \link operator[](Index) \endlink instead.
	 *
	 * Long version: this function is similar to
	 * \link operator[](Index) \endlink, but without the assertion.
	 * Use this for limiting the performance cost of debugging code when doing
	 * repeated coefficient access. Only use this when it is guaranteed that the
	 * parameters \a row and \a col are in range.
	 *
	 * If EIGEN_INTERNAL_DEBUGGING is defined, an assertion will be made, making this
	 * function equivalent to \link operator[](Index) \endlink.
	 *
	 * \sa operator[](Index), coeff(Index) const, coeffRef(Index,Index)
	 */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& coeffRef(Index index)
	{
		EIGEN_STATIC_ASSERT(internal::evaluator<Derived>::Flags & LinearAccessBit,
							THIS_COEFFICIENT_ACCESSOR_TAKING_ONE_ACCESS_IS_ONLY_FOR_EXPRESSIONS_ALLOWING_LINEAR_ACCESS)
		eigen_internal_assert(index >= 0 && index < size());
		return internal::evaluator<Derived>(derived()).coeffRef(index);
	}

	/** \returns a reference to the coefficient at given index.
	 *
	 * This method is allowed only for vector expressions, and for matrix expressions having the LinearAccessBit.
	 *
	 * \sa operator[](Index) const, operator()(Index,Index), x(), y(), z(), w()
	 */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& operator[](Index index)
	{
		EIGEN_STATIC_ASSERT(Derived::IsVectorAtCompileTime,
							THE_BRACKET_OPERATOR_IS_ONLY_FOR_VECTORS__USE_THE_PARENTHESIS_OPERATOR_INSTEAD)
		eigen_assert(index >= 0 && index < size());
		return coeffRef(index);
	}

	/** \returns a reference to the coefficient at given index.
	 *
	 * This is synonymous to operator[](Index).
	 *
	 * This method is allowed only for vector expressions, and for matrix expressions having the LinearAccessBit.
	 *
	 * \sa operator[](Index) const, operator()(Index,Index), x(), y(), z(), w()
	 */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& operator()(Index index)
	{
		eigen_assert(index >= 0 && index < size());
		return coeffRef(index);
	}

	/** equivalent to operator[](0).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& x() { return (*this)[0]; }

	/** equivalent to operator[](1).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& y()
	{
		EIGEN_STATIC_ASSERT(Derived::SizeAtCompileTime == -1 || Derived::SizeAtCompileTime >= 2, OUT_OF_RANGE_ACCESS);
		return (*this)[1];
	}

	/** equivalent to operator[](2).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& z()
	{
		EIGEN_STATIC_ASSERT(Derived::SizeAtCompileTime == -1 || Derived::SizeAtCompileTime >= 3, OUT_OF_RANGE_ACCESS);
		return (*this)[2];
	}

	/** equivalent to operator[](3).  */

	EIGEN_DEVICE_FUNC
	EIGEN_STRONG_INLINE Scalar& w()
	{
		EIGEN_STATIC_ASSERT(Derived::SizeAtCompileTime == -1 || Derived::SizeAtCompileTime >= 4, OUT_OF_RANGE_ACCESS);
		return (*this)[3];
	}
};

/** \brief Base class providing direct read-only coefficient access to matrices and arrays.
 * \ingroup Core_Module
 * \tparam Derived Type of the derived class
 *
 * \note #DirectAccessors Constant indicating direct access
 *
 * This class defines functions to work with strides which can be used to access entries directly. This class
 * inherits DenseCoeffsBase<Derived, ReadOnlyAccessors> which defines functions to access entries read-only using
 * \c operator() .
 *
 * \sa \blank \ref TopicClassHierarchy
 */
template<typename Derived>
class DenseCoeffsBase<Derived, DirectAccessors> : public DenseCoeffsBase<Derived, ReadOnlyAccessors>
{
  public:
	typedef DenseCoeffsBase<Derived, ReadOnlyAccessors> Base;
	typedef typename internal::traits<Derived>::Scalar Scalar;
	typedef typename NumTraits<Scalar>::Real RealScalar;

	using Base::cols;
	using Base::derived;
	using Base::rows;
	using Base::size;

	/** \returns the pointer increment between two consecutive elements within a slice in the inner direction.
	 *
	 * \sa outerStride(), rowStride(), colStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index innerStride() const { return derived().innerStride(); }

	/** \returns the pointer increment between two consecutive inner slices (for example, between two consecutive
	 * columns in a column-major matrix).
	 *
	 * \sa innerStride(), rowStride(), colStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index outerStride() const { return derived().outerStride(); }

	// FIXME shall we remove it ?
	EIGEN_CONSTEXPR inline Index stride() const
	{
		return Derived::IsVectorAtCompileTime ? innerStride() : outerStride();
	}

	/** \returns the pointer increment between two consecutive rows.
	 *
	 * \sa innerStride(), outerStride(), colStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index rowStride() const
	{
		return Derived::IsRowMajor ? outerStride() : innerStride();
	}

	/** \returns the pointer increment between two consecutive columns.
	 *
	 * \sa innerStride(), outerStride(), rowStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index colStride() const
	{
		return Derived::IsRowMajor ? innerStride() : outerStride();
	}
};

/** \brief Base class providing direct read/write coefficient access to matrices and arrays.
 * \ingroup Core_Module
 * \tparam Derived Type of the derived class
 *
 * \note #DirectWriteAccessors Constant indicating direct access
 *
 * This class defines functions to work with strides which can be used to access entries directly. This class
 * inherits DenseCoeffsBase<Derived, WriteAccessors> which defines functions to access entries read/write using
 * \c operator().
 *
 * \sa \blank \ref TopicClassHierarchy
 */
template<typename Derived>
class DenseCoeffsBase<Derived, DirectWriteAccessors> : public DenseCoeffsBase<Derived, WriteAccessors>
{
  public:
	typedef DenseCoeffsBase<Derived, WriteAccessors> Base;
	typedef typename internal::traits<Derived>::Scalar Scalar;
	typedef typename NumTraits<Scalar>::Real RealScalar;

	using Base::cols;
	using Base::derived;
	using Base::rows;
	using Base::size;

	/** \returns the pointer increment between two consecutive elements within a slice in the inner direction.
	 *
	 * \sa outerStride(), rowStride(), colStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index innerStride() const EIGEN_NOEXCEPT
	{
		return derived().innerStride();
	}

	/** \returns the pointer increment between two consecutive inner slices (for example, between two consecutive
	 * columns in a column-major matrix).
	 *
	 * \sa innerStride(), rowStride(), colStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index outerStride() const EIGEN_NOEXCEPT
	{
		return derived().outerStride();
	}

	// FIXME shall we remove it ?
	EIGEN_CONSTEXPR inline Index stride() const EIGEN_NOEXCEPT
	{
		return Derived::IsVectorAtCompileTime ? innerStride() : outerStride();
	}

	/** \returns the pointer increment between two consecutive rows.
	 *
	 * \sa innerStride(), outerStride(), colStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index rowStride() const EIGEN_NOEXCEPT
	{
		return Derived::IsRowMajor ? outerStride() : innerStride();
	}

	/** \returns the pointer increment between two consecutive columns.
	 *
	 * \sa innerStride(), outerStride(), rowStride()
	 */
	EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index colStride() const EIGEN_NOEXCEPT
	{
		return Derived::IsRowMajor ? innerStride() : outerStride();
	}
};

namespace internal {

template<int Alignment, typename Derived, bool JustReturnZero>
struct first_aligned_impl
{
	static EIGEN_CONSTEXPR inline Index run(const Derived&) EIGEN_NOEXCEPT { return 0; }
};

template<int Alignment, typename Derived>
struct first_aligned_impl<Alignment, Derived, false>
{
	static inline Index run(const Derived& m) { return internal::first_aligned<Alignment>(m.data(), m.size()); }
};

/** \internal \returns the index of the first element of the array stored by \a m that is properly aligned with respect
 * to \a Alignment for vectorization.
 *
 * \tparam Alignment requested alignment in Bytes.
 *
 * There is also the variant first_aligned(const Scalar*, Integer) defined in Memory.h. See it for more
 * documentation.
 */
template<int Alignment, typename Derived>
static inline Index
first_aligned(const DenseBase<Derived>& m)
{
	enum
	{
		ReturnZero = (int(evaluator<Derived>::Alignment) >= Alignment) || !(Derived::Flags & DirectAccessBit)
	};
	return first_aligned_impl<Alignment, Derived, ReturnZero>::run(m.derived());
}

template<typename Derived>
static inline Index
first_default_aligned(const DenseBase<Derived>& m)
{
	typedef typename Derived::Scalar Scalar;
	typedef typename packet_traits<Scalar>::type DefaultPacketType;
	return internal::first_aligned<int(unpacket_traits<DefaultPacketType>::alignment), Derived>(m);
}

template<typename Derived, bool HasDirectAccess = has_direct_access<Derived>::ret>
struct inner_stride_at_compile_time
{
	enum
	{
		ret = traits<Derived>::InnerStrideAtCompileTime
	};
};

template<typename Derived>
struct inner_stride_at_compile_time<Derived, false>
{
	enum
	{
		ret = 0
	};
};

template<typename Derived, bool HasDirectAccess = has_direct_access<Derived>::ret>
struct outer_stride_at_compile_time
{
	enum
	{
		ret = traits<Derived>::OuterStrideAtCompileTime
	};
};

template<typename Derived>
struct outer_stride_at_compile_time<Derived, false>
{
	enum
	{
		ret = 0
	};
};

} // end namespace internal

} // end namespace Eigen

#endif // EIGEN_DENSECOEFFSBASE_H
